Blockage-free water overflow from the water jacket of a quencher into the quenching chamber
View Patent ↗A quenching chamber of an entrained-flow gasifier that gasifies fuels at temperatures of up to 1,800° C. and pressures of up to 10 MPa, wherein an annular chamber through which cooling water flows is formed between the pressure-bearing tank and the inner jacket. The overflow water is discharged from the annular chamber (skirt water) into the quenching chamber via the sleeve of a quenching lance, wherein blocking by the spray cone of the spray nozzle is prevented. The cooling water from the annular chamber is used in addition to the quenching water from the spray nozzle to cool and clean the raw gas in the quenching chamber.
1. A device for cooling hot raw gas and slag from the entrained-flow gasification of liquid and solid fuels at temperatures of the raw gas of from 1200 to 1800° C. and pressures of up to 10 MPa, comprising:
a quenching chamber arranged below a gasification reactor,
an inner jacket which delimits the quenching chamber arranged in a pressure-bearing container wall in such a way that an annular gap is formed between the container wall and the inner jacket,
a feed of cooling water provided via a connection piece at a lower end of the annular gap in such a way that said cooling water rises upward in the annular gap, and
at least one quenching lance which has a quenching nozzle, which is encased by a sleeve, for injecting cooling water into the quenching chamber and which is arranged in such a way that it penetrates through the container wall and the inner jacket,
wherein the sleeve has an opening for discharge of the cooling water from the annular gap into the quenching chamber at a point where it extends in the annular gap.
2. The device as claimed in claim 1 ,
wherein a nozzle head of the quenching nozzle is set back from an open end of the sleeve by from 1 to 4 times the nozzle diameter.
3. The device as claimed in claim 1 ,
wherein the sleeve projects beyond the inner jacket into the quenching chamber.
4. The device as claimed in claim 3 ,
wherein the annular gap is connected to the sleeve via a pipeline.
5. The device as claimed in claim 4 ,
wherein the pipeline has a compensator for length compensation.
6. The device as claimed in claim 1 , further comprising:
a plurality of annular gaps which are separated from one another are arranged at different levels of the quenching chamber, and
wherein the sleeve is connected via a pipeline to an outlet of an annular gap which is not identical to the annular gap in which the quenching nozzle together with sleeve is arranged.